
<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
</head>
<body>
  <script>
    class Person{
      constructor(name){
        this.name = name
      }
    }
    Person.age = '13'

    const a = new Person('zhangsbag')
    const b = new Person('bbb')
    console.log('exact',a,b)
  </script>
</body>
</html>